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3) Variation of Draft Level
When the ship travels unloaded, the draft level goes low and air bubbles are apt to be pushed
down to the transducer location. This occurs especially when the water level is lower than the
center line of the bulbous bow. It is recommended to load a proper amount of ballast not only for
the DS-30 but also for safety of navigation.
4) Interference of Other Ultrasonic Equipment
If integer multiple of the transmission frequency of other ultrasonic equipment is within 440 ± 8
kHz, interference may occur. Select a location at least 1 m away from the transducer of the
ultrasonic equipment and change, if possible, the direction of its transmission beam so that the
beam may not cross the beam of DS-30.
5) Installation in Dangerous Place
Do not install the transducer in the oil tank, oil room, LPG gas room and freezing room.
6) Maintenance Space
The transducer is detachable/replaceable in the water from outside the ship.
1.1.2 Other Indoor Units
All units are designed and constructed to withstand humidity and corrosive atmosphere common to a
vessel. However certain guidelines must be observed to ensure continued operation. When selecting a
mounting location, keep the following points in mind.
1) Avoid place subject to high temperature/humidity. This includes heat emitting apparatuses and
sunshine.
2) Avoid places subject to sea splash. Sea splashes most assuredly damage the sensitive components
inside units.
3) Locate the units where they will not become soiled easily. Never locate it near exhaust pipes.
4) Select a place where vibration is minimal.
5) Select a place with sufficient ventilation.